Numerus- who was counted?

[Frank]

Yes, so the Roman army of the first two centuries CE was "one of the best organized armies." But even then, I think that we know much less about what records were kept by a marching army then what records were kept by units in camp.

Well, I doubt that this daily morning report was not performed in a field-camp during a campaign. If an army had something like daily strength reports, there is no reason to assume, that they have'nt been really daily. There is at least one case I remember. Stauner describes this scene (Ios. bell. Iud. 3,87f and App. civ. 5,46). The centurions collected every morning the necessary information, forwarded it to the tribunes, and they went with the legates to the Legatus Augusti pro praeteore in the camp.